How do you print an anonymous function properly in a figure title?

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KieranSQ 2019-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/444317-how-do-you-print-an-anonymous-function-properly-in-a-figure-title

评论： KieranSQ 2019-2-11

I am trying to print an anonymous function as part of a title for a plot. I would like it to look like a latex entry where

but we get f(x)=@(x)x.^2 instead.

I have provided a MWE below;

f=@(x) x.^2
x_coordinates=[1:10]
fx=f(x_coordinates)
plot(x_coordinates,fx)
title(sprintf('The Evolution of the Heat Equation with Source f(x)=%s', func2str(f)))

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Stephan 2019-2-11

https://de.mathworks.com/help/symbolic/latex.html?s_tid=doc_ta#bu7szcu

KieranSQ 2019-2-11

Many thanks for your comment, but this does not wokr for a function handle - is there anything that would do this job?

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Answer 1

aara 2019-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444317-how-do-you-print-an-anonymous-function-properly-in-a-figure-title#answer_360491

在 MATLAB Online 中打开

You could do it by manipulating the equation of the function alone and then adding it to the remaining text:

f=@(x) x.^2
x_coordinates=[1:10]
fx=f(x_coordinates)
plot(x_coordinates,fx)
eqn = func2str(f);%changes to a char array
eqn2 = eqn(5:end);%removes the '@(x) handle
eqn3 = replace(eqn2,'.','') %removes the . used for multiplication
placeholder1 = "The Evolution of the Heat Equation with Source $f(x)=" + string(eqn3+ "$")
title(placeholder1,'Interpreter','latex')

Not sure if this works for all equations.

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KieranSQ 2019-2-11

Thank you for this - yes it works for this particular case. The issue now would be if there is a decimal present as a scaling.

KieranSQ 2019-2-11

在 MATLAB Online 中打开

I have now found a way to remove certain parts of the string without losing others - we would use something like this,

eqn = func2str(fu);%changes to a char array
    eqn2 = eqn(5:end);%removes the '@(x) handle
    eqn2=strrep(eqn2,'.*','')
    eqn3=strrep(eqn2,'.^','^')
    eqn3=strrep(eqn2,'./','/')